{"id":"9dfbd8d8-e817-4947-b964-410e1e0ae56b","shortId":"E6TkPS","kind":"x402","title":"Query NFT ownership data via x402 micropayment on Base for $0.02 per request.","tagline":"Query NFT ownership data via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns NFT ownership information for NFT #38. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/nfts/38/owner` accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact scheme. The maximum amount required is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 USD. No API keys, rate limits, or upfront commitments are needed — each call is independently paid.\n\nThe platform advertises a uniform $0.02 per request across all its endpoints. Documentation beyond the landing page is sparse: the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (402 challenge returned successfully).","tags":[],"capabilities":["nft-ownership-query","x402-micropayment","usdc-payment","base-network","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","token holder query","x402 NFT API","Base USDC micropayment API","on-chain NFT data"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown.","The endpoint path is hardcoded to NFT ID 38; it is unclear whether other NFT IDs are supported via similar paths.","The /api, /pricing, and /README pages returned no useful content (only wallet-connect prompts).","The platform lists many endpoint categories (AI, finance, infrastructure) but this specific endpoint is an NFT query not listed on the homepage."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/38/owner","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/nfts/38/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documented examples, and the endpoint's purpose (NFT #38 owner) is only inferred from the URL path. The broader platform docs are effectively empty beyond the landing page 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'/api/v1/nfts/38/owner':75 '/pricing':151 '/readme':153 '0.02':11,24,113,135 '000':103 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':108 '20':102 '38':37 '402':191 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':76 'across':51,138 'addit':165 'advertis':132 'ai/ml':54 'amount':99 'analyt':53 'api':50,116 'avail':181 'base':9,22,68,104,110 'base-network' 'beyond':143 'broader':43 'call':126 'categori':59 'challeng':192 'commit':122 'confirm':189 'connect':161 'crawl':184 'data':4,17,52 'detail':167 'document':142,176 'endpoint':28,74,141,187 'equal':112 'exact':95 'exampl':180 'finance/web3':56 'handl':84 'header':91 'independ':128 'infer':55 'inform':34 'infrastructur':58 'inlin':85 'json':81 'key':117 'land':145 'limit':119 'live':190 'lowpaymentfee.com':30 'materi':185 'maximum':98 'micropay':7,20 'need':124 'network':69 'nft':2,15,32,36 'nft-ownership-query' 'no-api-key' 'offer':45 'on-chain NFT data' 'openapi':171 'ownership':3,16,33 'page':146,154 'paid':129 'part':40 'pay':47 'pay-per-request':46 'payment':82,90 'per':12,25,48,136 'platform':44,131 'post':77 'prompt':162 'protocol':65 'queri':1,14 'rate':118 'request':13,26,49,78,137 'request/response':174 'requir':100 'resolv':156 'return':31,80,193 'schema':175 'scheme':96 'settl':61 'spars':148 'spec':172 'specif':73 'success':194 'technic':166 'token holder query' 'uniform':134 'unit':105 'upfront':121 'usag':179 'usd':114 'usdc':71,107 'usdc-payment' 'use':70,92 'via':5,18,62,86 'wallet':160 'wallet-connect':159 'x':89 'x-payment':88 'x402':6,19,64,94 'x402 NFT API' 'x402-micropayment'","prices":[{"id":"8d4017dd-172e-4741-9c07-b04722b102ae","listingId":"9dfbd8d8-e817-4947-b964-410e1e0ae56b","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/nfts/38/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.169Z"}],"sources":[{"listingId":"9dfbd8d8-e817-4947-b964-410e1e0ae56b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/38/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.169Z","lastSeenAt":"2026-04-22T16:32:58.738Z"}],"details":{"listingId":"9dfbd8d8-e817-4947-b964-410e1e0ae56b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/38/owner \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, requiring USDC payment on Base network.","source_url":"https://lowpaymentfee.com/api/v1/nfts/38/owner"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/nfts/38/owner"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying the current owner of a specific NFT programmatically","Building NFT portfolio dashboards that need ownership verification","Automated agents checking NFT ownership before executing downstream logic"],"bestFor":["Agents needing one-off NFT ownership checks without API key setup","Developers prototyping NFT-aware applications with minimal friction","Micropayment-native workflows on the Base network"],"notFor":["Bulk enumeration of all NFT owners across a collection (no batch endpoint documented)","Querying NFTs beyond ID 38 on this specific endpoint (path is hardcoded to NFT 38)","Users who need detailed NFT metadata beyond ownership"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.185Z"},"updatedAt":"2026-04-22T16:32:58.738Z"}}